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Patented-Jan. 17, 1888.

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l l l l l l l l I I N. PETERS, Fnowumegnpm. Washington. D. x;

UNITED STATES e rPATENT OFFICE...

FRED. H. BROWN, OE NEW YORK, N. Y., AssieNOR TO THE MAGNETO. y

TELEGRAPH COMPANY, OE NEW YORK.

MAeNvETo-*Ti-:LEPHONL SPECIFICATION forming part of Letters Patent No. 376,706, dated January 17, 1888.

Application filed March 3l, 1886.

York, have invented a new and useful Improvement in Magneto-Telephones, of which the following is fa specification, reference bef ing had to the accompanying drawings.

My invention relates to an improvement in magneto-telephones; and it consists in a transmitting-telephone hav-ing the magnet provided with parallel arms of the same polarity but unequal strength,the diaphragm secured magnetically to the weaker pole' andk free to vibrate over the stronger, and helices on the parallel arms, in. combination with a receiving-telephone having the magnet provided with parallel arms of the same polarity butI unequal in strength, helices on the said arms, and a diaphragm secured magnetically to the stronger arm and free to vibrate over the weaker arm, as will be set forth more fully hereinafter, and particularly pointed out in the claim.

rIhe accompanying diagram represents a pair of my improvedV telephones connected in circuit.

A represents the transmitling-telephone, in which B represents the permanent magnet, which is composed ofthe bar b, having at one end the parallel arms b b", of the same polarity but of diiit'erent magnetic strength, the arm b at the outer end ofthe bar being magnetically stronger than its companionarm b, which is located between the arm b and the neutral point of the magnet. Y The bar formsan extend-ed arm of opposite polarity to the parall lel arms. y

C represents the transmittingJdivaphragm, which is connected magnetically at Aone sideY to -the 'weaker magnetic arm, b2, and has its central portion arranged over the stronger magnetic parallel arm, vb', and free to vibrate over the said arm. The usual helices, D, are coiled on the parallelarms of the magnet. This construction of the transmitting-telephone is the same as that shown and described in my Patent No. 341,370, dated May 4, 1886.

fare wound on the poles b and.k b2; Y n rangement reduces the magnetic stress yor ten-` sion on the receiving-diaphragm at the point serial No. 197,345. (No model.)

Z yrepresents the receiving-telephone,which where the amplitude of its vibration isgreater, which renders it more sensitive t'o the intluence ot the variations in the receiving magnetic field.

The intensity of the magnetic field in the rehelix on the weaker magnetic arm, thus rendering the said magnetic field more sensitive f tothe rapidly-alternatingv currents generated Y /l by the transmitting-telephone and causing the receiving-diaphragm to vibrate with maxi-K f f mum rapidity and mobility.l

Having thus described my invention,v I elaimy The transinitting-telephone having the'magnet provided with the arms of unequal magnetic strength, the diaphragm secured mag` netically to the weaker pole and free to vibrate over'the stronger, and the helices onthe paryallel arms, in combination with the receivingtelephone having the magnet provided with the arms of unequal strength, the helices on the said arms, Vand the diaphragm secured magnetically to the stronger arm and free to vibrate over the weaker arm, substantiallyas described. if Y v lIn testimony that I claim the foregoing as my own I have hereto affixed my signature in K presence of two witnesses. W

,ERED. H. R'ROWN.

Witnesses: r A

WILLIAM H. OLARKSON, Adern BARONN 65 i ceiving-telephone is weakened by placing the 

